1 /*
2 * Copyright (C) 2008, Shawn O. Pearce <spearce@spearce.org>
3 * and other copyright owners as documented in the project's IP log.
4 *
5 * This program and the accompanying materials are made available
6 * under the terms of the Eclipse Distribution License v1.0 which
7 * accompanies this distribution, is reproduced below, and is
8 * available at http://www.eclipse.org/org/documents/edl-v10.php
9 *
10 * All rights reserved.
11 *
12 * Redistribution and use in source and binary forms, with or
13 * without modification, are permitted provided that the following
14 * conditions are met:
15 *
16 * - Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 *
19 * - Redistributions in binary form must reproduce the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer in the documentation and/or other materials provided
22 * with the distribution.
23 *
24 * - Neither the name of the Eclipse Foundation, Inc. nor the
25 * names of its contributors may be used to endorse or promote
26 * products derived from this software without specific prior
27 * written permission.
28 *
29 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
30 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
31 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
32 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
33 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
34 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
35 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
36 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
37 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
38 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
40 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
41 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
42 */
43
44 package org.eclipse.jgit.internal.storage.file;
45
46 import java.io.IOException;
47 import java.io.OutputStream;
48
49 import org.eclipse.jgit.transport.PackedObjectInfo;
50 import org.eclipse.jgit.util.NB;
51
52 /**
53 * Creates the version 2 pack table of contents files.
54 *
55 * @see PackIndexWriter
56 * @see PackIndexV2
57 */
58 class PackIndexWriterV2 extends PackIndexWriter {
59 private static final int MAX_OFFSET_32 = 0x7fffffff;
60 private static final int IS_OFFSET_64 = 0x80000000;
61
62 PackIndexWriterV2(final OutputStream dst) {
63 super(dst);
64 }
65
66 @Override
67 protected void writeImpl() throws IOException {
68 writeTOC(2);
69 writeFanOutTable();
70 writeObjectNames();
71 writeCRCs();
72 writeOffset32();
73 writeOffset64();
74 writeChecksumFooter();
75 }
76
77 private void writeObjectNames() throws IOException {
78 for (final PackedObjectInfo oe : entries)
79 oe.copyRawTo(out);
80 }
81
82 private void writeCRCs() throws IOException {
83 for (final PackedObjectInfo oe : entries) {
84 NB.encodeInt32(tmp, 0, oe.getCRC());
85 out.write(tmp, 0, 4);
86 }
87 }
88
89 private void writeOffset32() throws IOException {
90 int o64 = 0;
91 for (final PackedObjectInfo oe : entries) {
92 final long o = oe.getOffset();
93 if (o <= MAX_OFFSET_32)
94 NB.encodeInt32(tmp, 0, (int) o);
95 else
96 NB.encodeInt32(tmp, 0, IS_OFFSET_64 | o64++);
97 out.write(tmp, 0, 4);
98 }
99 }
100
101 private void writeOffset64() throws IOException {
102 for (final PackedObjectInfo oe : entries) {
103 final long o = oe.getOffset();
104 if (MAX_OFFSET_32 < o) {
105 NB.encodeInt64(tmp, 0, o);
106 out.write(tmp, 0, 8);
107 }
108 }
109 }
110 }